General:
 * Use Nepomuk describeResource and storeResource to send somehow an additional
   trig or rdf file.
 * Stop transfer button.
 * Investigate why sometimes the job cannot be removed from the system tray
 * Investigate why sometimes the file transfer handler exits when transfer ends
 * Close channels when transfer ends
 * Show advancement in the job ui

Incoming file transfers
 * save as file.part and rename at the end + resume support
 * Configuration of the download directory from some ui.
 * File transfer support in the approver.

Outgoing file transfers
